More than 6,000 users of Cardiogram were recruited into the study. And using the special DeepHeart neural network, it was able to detect hypertension with an 82 percent accuracy and sleep apnea with 90 percent accuracy.

A blog post from Cardiogram’s co-founder Brandon Ballinger explains more about the link between heart rate and hypertension and sleep apnea:

In May, another study from Cardiogram and UCSF showed that Apple’s wearable can detect an abnormal heart rhythm with an accuracy of 97 percent.

Cardiogram is designed for the iPhone and Apple Watch and can be downloaded on the App Store now for free. The watch app and complication show a graph of heart rate information in real time. On the iPhone side, users can view more details and historical trends.